/* 
 * Copyright (c) 2012, Fromentin Xavier, Schnell Michaël, Dervin Cyrielle, Brabant Quentin
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *      * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *      * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *      * The names of its contributors may not be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Fromentin Xavier, Schnell Michaël, Dervin Cyrielle OR Brabant Quentin 
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package kameleon.gui.util;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;

import kameleon.exception.FileReadingException;

/**
 * Utility class for retrieving bytes from a given picture file.
 * 
 * @author		Schnell Michaël
 * @version		1.0
 */
public class ImageUtility {

	/**
	 * Returns an array containing all the bytes read from a given
	 * {@code InputStream}.
	 * 
	 * @param 	is
	 * 			source stream for the read bytes
	 * 
	 * @return	Array containing all the bytes read from the given
	 * 			stream
	 * 
	 * @throws 	FileReadingException
	 * 			if an error occurred while reading the stream
	 */
	public static byte[] getImageBytes(InputStream is) 
			throws FileReadingException {
		// Read all the bytes into a buffer
		ArrayList<Integer> buffer = new ArrayList<Integer>() ;
		try {
			int next = is.read() ;
			while (next != -1) {
				buffer.add(new Integer(next)) ;
				next = is.read() ;
			}// while
		} catch (IOException e) {
			throw new FileReadingException() ;
		}// try
		
		// Copy the content of the buffer into an array
		byte[] imageBytes = new byte[buffer.size()] ;
		int index = 0 ;
		for(Integer b : buffer) {
			imageBytes[index] = b.byteValue() ;
			index++ ;
		}// for
		
		return imageBytes ;
	}// getImagesBytes(InputStream)

	/**
	 * Returns an array containing all the bytes read from the file
	 * with the given path.
	 * 
	 * @param 	source
	 * 			absolute path of the source file
	 * 
	 * @return	Array containing all the bytes read from the given
	 * 			file
	 * 
	 * @throws 	FileReadingException
	 * 			if an error occurred while reading the stream
	 */
	public static byte[] getImageBytes(String source) 
			throws FileReadingException {
		try {
			InputStream is = new BufferedInputStream(
					new FileInputStream(source));
			byte[] result = getImageBytes(is) ;
			is.close() ;
			return result ;
		} catch (FileNotFoundException e) {
			throw new FileReadingException(new File(source)) ;
		} catch (IOException e) {
			throw new FileReadingException(new File(source)) ;
		}// try
	}// getImageBytes(String)

}// class ImageUtility